ascilch/digitaltwin/screenshot-camera

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Capture a screenshot from a Unity `Camera` and return it as a PNG image for direct LLM inspection. Falls back to `Camera.main` (then any active camera) when `cameraRef` is null. Width and height are capped to keep response size manageable.

Install

npx vskill@latest install ascilch/digitaltwin/screenshot-camera

SKILL.md

The same SKILL.md was published earlier as ivanmurzak/unity-mcp/screenshot-camera.

Screenshot / Camera

Captures a screenshot from a camera and returns it as an image. If no camera is specified, uses the Main Camera. Returns the image directly for visual inspection by the LLM.

Inputs

  • cameraRef (optional) — reference to a GameObject hosting a Camera. When null, Camera.main is used; if there is no main camera, the first entry of Camera.allCameras is used.
  • width (default 1920) / height (default 1080) — output pixels. Must be > 0 and ≤ MaxDimension.

Behavior

Allocates a temporary RenderTexture, swaps it onto the chosen camera, calls Camera.Render, reads back via Texture2D.ReadPixels, encodes as PNG, and restores the camera's prior targetTexture. Returns a ResponseCallTool.Image with image/png MIME and a descriptive caption.

How to Call

bash
unity-mcp-cli run-tool screenshot-camera --input '{
  "cameraRef": "string_value",
  "width": 0,
  "height": 0
}'
For complex input (multi-line strings, code), save the JSON to a file and use:
```bash
unity-mcp-cli run-tool screenshot-camera --input-file args.json
```
Or pipe via stdin (recommended):
```bash
unity-mcp-cli run-tool screenshot-camera --input-file - <<'EOF'
{"param": "value"}
EOF
```
Troubleshooting

If unity-mcp-cli is not found, either install it globally (npm install -g unity-mcp-cli) or use npx unity-mcp-cli instead. Read the /unity-initial-setup skill for detailed installation instructions.

Input

NameTypeRequiredDescription
cameraRefanyNoReference to the camera GameObject. If not specified, uses the Main Camera.
widthintegerNoWidth of the screenshot in pixels.
heightintegerNoHeight of the screenshot in pixels.
Input JSON Schema
json
{
  "type": "object",
  "properties": {
    "cameraRef": {
      "$ref": "#/$defs/AIGD.GameObjectRef"
    },
    "width": {
      "type": "integer"
    },
    "height": {
      "type": "integer"
    }
  },
  "$defs": {
    "System.Type": {
      "type": "string"
    },
    "AIGD.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "type": "integer",
          "description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
        },
        "path": {
          "type": "string",
          "description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
        },
        "name": {
          "type": "string",
          "description": "Name of a GameObject in hierarchy. Priority: 3."
        },
        "assetType": {
          "$ref": "#/$defs/System.Type",
          "description": "Type of the asset."
        },
        "assetPath": {
          "type": "string",
          "description": "Path to the asset within the project. Starts with 'Assets/'"
        },
        "assetGuid": {
          "type": "string",
          "description": "Unique identifier for the asset."
        }
      },
      "required": [
        "instanceID"
      ],
      "description": "Find GameObject in opened Prefab or in the active Scene."
    }
  }
}

Output

This tool does not return structured output.

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